More crews were arriving to battle the destructive and fast-moving Blue Cut Fire through the night after the blaze charred more than 28 square miles Tuesday alone, forcing the closure of the Cajon Pass, and burning structures with no end in sight.

The devastating blaze came as a punishing summer heat wave swept across Southern California.

By Tuesday evening, 82,000 residents were under mandatory evacuations and Gov. Jerry Brown declared a state of emergency. The fire was zero percent contained at 11 p.m. PT, according to CalFire.

The so-called Blue Cut Fire, named because it started near a trail called Blue Cut, erupted at 10:36 a.m. Tuesday in the Cajon Pass near Kenwood Avenue west of Interstate 15.

Nobody was seriously hurt, but the fire left two firefighters with minor injuries.

Two firefighters were hurt when they became trapped by fire while defending homes and assisting evacuations in the Swarthout Canyon area west of the Cajon Pass. They took shelter in a home, but were briefly hospitalized and returned to the fire line defending structures.

The fire shut down both directions of Interstate 15 from Oak Hill Road to Kenwood Avenue, Caltrans reported. A photo from a motorist showed a line of vehicles sitting on a stretch of highway under a red, apocalyptic plume. A video on Instagram showed cars and semis stranded on Interstate 15. A cement truck can be seen driving in reverse.

Highway 138 to Lone Pine Canyon was closed. A video by a newspaper reporter showed flames approaching State Route 138, which runs east-west along the northern foothills of the San Gabriel Mountains and the Mojave Desert.

Students at Kimbark Elementary School were being transported to Cesar Chavez School in San Bernardino. Snowline Unified School District also evacuated student to Wrightwood Elementary School. Any parents who could not pick up their children by 3 p.m. would be reunited at Serrano High School.

Bus routes were canceled in Wrightwood and the West Cajon Valley for Snowline Unified. Any students who were aboard buses on the route would also be taken to Serrano High School.

Red Cross emergency shelters were set up for evacuees at the Jessie Turner Community Center, 15556 Summit Ave., in Fontana, and also at Sultana High School, at 17311 Sultana St., in Hesperia, which has become the designated overnight shelter.

The fire is raging during an extreme heat wave and a historic drought and when a red-flag fire warning and an air quality alert was issued for the area.

The number of fires in the state has grown 20 percent over the last decade, going from more than 4,800 fires in 2006 to nearly 5,800 fires in 2015, according to data from the California Department of Forestry and Fire Protection.